Ansible 2 0 API解析

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看了ansible的文档,发现文档的API接口定义的特别简单,找了一个测试用例在安装了ansible的机器上跑了一下,能跑通,就开始调试源码看看为什么要这样写。在/usr/bin目录下找到ansible命令的源码,发现关键点在AdHocCLI这个类。然后找到这个类所在的位置/cli/adhoc.py。一番调试后,发现官网上的API接口就是从AdHocCLI这个类中抽取的。

ansible命令执行结果处理类:

class ResultsCollector(CallbackBase):

    def __init__(self, *args, **kwargs):
        super(ResultsCollector, self).__init__(*args, **kwargs)
        self.host_ok = {}
        self.host_unreachable = {}
        self.host_failed = {}

    def v2_runner_on_unreachable(self, result):
        self.host_unreachable[result._host.get_name()] = result

    def v2_runner_on_ok(self, result,  *args, **kwargs):
        self.host_ok[result._host.get_name()] = result

    def v2_runner_on_failed(self, result,  *args, **kwargs):
        self.host_failed[result._host.get_name()] = result

动态生成Inventory:

class MyInventory(Inventory):
    """
    this is my ansible inventory object.
    """
    def __init__(self, resource, loader, variable_manager):
        """
        resource的数据格式是一个列表字典,比如
            {
                "group1": {
                    "hosts": [{"hostname": "10.0.0.0", "port": "22", "username": "test", "password": "pass"}, ...],
                    "vars": {"var1": value1, "var2": value2, ...}
                }
            }

        如果你只传入1个列表,这默认该列表内的所有主机属于my_group组,比如
            [{"hostname": "10.0.0.0", "port": "22", "username": "test", "password": "pass"}, ...]
        """
        self.resource = resource
        self.inventory = Inventory(loader=loader, variable_manager=variable_manager, host_list=[])
        self.gen_inventory()

    def my_add_group(self, hosts, groupname, groupvars=None):
        """
        add hosts to a group
        """
        my_group = Group(name=groupname)

        # if group variables exists, add them to group
        if groupvars:
            for key, value in groupvars.iteritems():
                my_group.set_variable(key, value)

        # add hosts to group
        for host in hosts:
            # set connection variables
            hostname = host.get("hostname")
            hostip = host.get('ip', hostname)
            hostport = host.get("port")
            username = host.get("username")
            password = host.get("password")
            ssh_key = host.get("ssh_key")
            my_host = Host(name=hostname, port=hostport)
            my_host.set_variable('ansible_ssh_host', hostip)
            my_host.set_variable('ansible_ssh_port', hostport)
            my_host.set_variable('ansible_ssh_user', username)
            my_host.set_variable('ansible_ssh_pass', password)
            my_host.set_variable('ansible_ssh_private_key_file', ssh_key)

            # set other variables
            for key, value in host.iteritems():
                if key not in ["hostname", "port", "username", "password"]:
                    my_host.set_variable(key, value)
            # add to group
            my_group.add_host(my_host)

        self.inventory.add_group(my_group)

    def gen_inventory(self):
        """
        add hosts to inventory.
        """
        if isinstance(self.resource, list):
            self.my_add_group(self.resource, 'default_group')
        elif isinstance(self.resource, dict):
            for groupname, hosts_and_vars in self.resource.iteritems():
                self.my_add_group(hosts_and_vars.get("hosts"), groupname, hosts_and_vars.get("vars"))

ansible API:

class MyRunner(object):
    """
    This is a General object for parallel execute modules.
    """
    def __init__(self, resource, *args, **kwargs):
        self.resource = resource
        self.inventory = None
        self.variable_manager = None
        self.loader = None
        self.options = None
        self.passwords = None
        self.callback = None
        self.__initializeData()
        self.results_raw = {}

    def __initializeData(self):
        """
        初始化ansible
        """
        Options = namedtuple('Options', ['connection','module_path', 'forks', 'timeout',  'remote_user',
                'ask_pass', 'private_key_file', 'ssh_common_args', 'ssh_extra_args', 'sftp_extra_args',
                'scp_extra_args', 'become', 'become_method', 'become_user', 'ask_value_pass', 'verbosity',
                'check', 'listhosts', 'listtasks', 'listtags', 'syntax'])

        # initialize needed objects
        self.variable_manager = VariableManager()
        self.loader = DataLoader()
        self.options = Options(connection='smart', module_path='/usr/share/ansible', forks=100, timeout=10,
                remote_user='root', ask_pass=False, private_key_file=None, ssh_common_args=None, ssh_extra_args=None,
                sftp_extra_args=None, scp_extra_args=None, become=None, become_method=None,
                become_user='root', ask_value_pass=False, verbosity=None, check=False, listhosts=False,
                listtasks=False, listtags=False, syntax=False)

        self.passwords = dict(sshpass=None, becomepass=None)
        self.inventory = MyInventory(self.resource, self.loader, self.variable_manager).inventory
        self.variable_manager.set_inventory(self.inventory)

    def run(self, host_list, module_name, module_args,):
        """
        run module from andible ad-hoc.
        module_name: ansible module_name
        module_args: ansible module args
        """
        # create play with tasks
        play_source = dict(
                name="Ansible Play",
                hosts=host_list,
                gather_facts='no',
                tasks=[dict(action=dict(module=module_name, args=module_args))]
        )
        play = Play().load(play_source, variable_manager=self.variable_manager, loader=self.loader)

        # actually run it
        tqm = None
        self.callback = ResultsCollector()
        try:
            tqm = TaskQueueManager(
                    inventory=self.inventory,
                    variable_manager=self.variable_manager,
                    loader=self.loader,
                    options=self.options,
                    passwords=self.passwords,
            )
            tqm._stdout_callback = self.callback
            result = tqm.run(play)
        finally:
            if tqm is not None:
                tqm.cleanup()

    def run_playbook(self, host_list, role_name, role_uuid, temp_param):
        """
        run ansible palybook
        """
        try:
            self.callback = ResultsCollector()
            filenames = [BASE_DIR + '/handlers/ansible/v1_0/sudoers.yml']    #playbook的路径
            logger.info('ymal file path:%s'% filenames)
            template_file = TEMPLATE_DIR            #模板文件的路径
            if not os.path.exists(template_file):
                logger.error('%s 路径不存在 '%template_file)
                sys.exit()

            extra_vars = {}     #额外的参数 sudoers.yml以及模板中的参数,它对应ansible-playbook test.yml --extra-vars "host='aa' name='cc' "
            host_list_str = ','.join([item for item in host_list])
            extra_vars['host_list'] = host_list_str
            extra_vars['username'] = role_name
            extra_vars['template_dir'] = template_file
            extra_vars['command_list'] = temp_param.get('cmdList')
            extra_vars['role_uuid'] = 'role-%s'%role_uuid
            self.variable_manager.extra_vars = extra_vars
            logger.info('playbook 额外参数:%s'%self.variable_manager.extra_vars)
            # actually run it
            executor = PlaybookExecutor(
                playbooks=filenames, inventory=self.inventory, variable_manager=self.variable_manager, loader=self.loader,
                options=self.options, passwords=self.passwords,
            )
            executor._tqm._stdout_callback = self.callback
            executor.run()
        except Exception as e:
            logger.error("run_playbook:%s"%e)

    def get_result(self):
        self.results_raw = {'success':{}, 'failed':{}, 'unreachable':{}}
        for host, result in self.callback.host_ok.items():
            self.results_raw['success'][host] = result._result

        for host, result in self.callback.host_failed.items():
            self.results_raw['failed'][host] = result._result['msg']

        for host, result in self.callback.host_unreachable.items():
            self.results_raw['unreachable'][host]= result._result['msg']

        logger.debug("Ansible执行结果集:%s"%self.results_raw)
        return self.results_raw

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